<!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8">
    <title>在线尝试 Bootstrap 实例</title>
    <meta name="viewport" content="width=device-width,
                                     initial-scale=1.0,
                                     maximum-scale=1.0,
                                     user-scalable=no">

    <link rel="stylesheet" href="css/bootstrap.css">
    <script src="js/jquery-3.2.1.js"></script>
    <script src="js/bootstrap.js"></script>
</head>
<body>
<div class="container">

<form role="form">
    <div class="form-group">
        <label for="name">名称</label>
        <input type="text" class="form-control" id="name"
               placeholder="请输入名称">
    </div>
    <div class="form-group">
        <label for="inputfile">文件输入</label>
        <input type="file" id="inputfile"  class="form-control">
        <p class="help-block">这里是块级帮助文本的实例。</p>
    </div>
    <div class="checkbox">
        <label>
            <input type="checkbox"  > 请打勾
        </label>
    </div>
    <button type="submit" class="btn btn-default"  class="form-control">提交</button>
</form>

</div>

</body>
</html>